Irrational: meaning, definitions and examples

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irrational

[ ɪˈræʃənl ]

^{Context #1}

thinking

Not logical or reasonable; based on emotions rather than facts or reasons.

Synonyms

illogical, unreasonable

Examples of usage

He was being completely irrational about the situation.
Her decision to quit her job seemed irrational to everyone else.
The fear of flying is often irrational and not based on actual statistics.

^{Context #2}

mathematics

A number that cannot be expressed as a fraction; a non-terminating, non-repeating decimal.

Synonyms

non-logical, non-rational, unreasonable

Examples of usage

The square root of 2 is an irrational number.
Pi is an irrational number because it cannot be expressed as a simple fraction.

Translations

Translations of the word "irrational" in other languages:

🇵🇹 irracional

🇮🇳 अतार्किक

🇩🇪 irrational

🇮🇩 irasional

🇺🇦 ірраціональний

🇵🇱 irracjonalny

🇯🇵 非合理的 (ひごうりてき)

🇫🇷 irrationnel

🇪🇸 irracional

🇹🇷 irrasyonel

🇰🇷 비합리적 (bihamrijeok)

🇸🇦 غير منطقي

🇨🇿 iracionální

🇸🇰 iracionálny

🇨🇳 非理性 (fēi lǐ xìng)

🇸🇮 iracionalen

🇮🇸 órökréttur

🇰🇿 иррационалды

🇬🇪 არაცნობიერი

🇦🇿 irrasional

🇲🇽 irracional

Word origin

The word 'irrational' originated from the Latin word 'irrationalis', which means 'not endowed with reason'. Its usage in English dates back to the early 15th century. Initially, the term was predominantly associated with philosophical discussions on human behavior and thought processes. Over time, the word evolved to encompass various contexts, including mathematics, where it refers to numbers that cannot be expressed as fractions. Today, 'irrational' is commonly used to describe behavior or beliefs that lack logical reasoning.